Lock



FIG. 1 is a front perspective view of a lock showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The portions of the Figures shown in phantom lines form no part of theclaimed design and for illustrative purposes only.

I claim the ornamental design for a lock, as shown and described.